<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 警告区域 :closable="false"(是否展示“X”号) show-icon(显示图标) -->
            <el-alert title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区 -->
              <el-row class="cat_apt">
                  <el-col>
                      <span>选择商品分类: </span>
                      <!-- 选择商品分类的级联选择框 -->
                      <el-cascader
                         v-model="selectedCateKeys"
                         :options="catelist"
                         :props="cateProps"
                         @change="handleChange"></el-cascader>
                  </el-col>
              </el-row>
              <!-- tab页签区域 -->
              <el-tabs v-model="activeName" @tab-click="handleTabClick">
                  <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="idBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData"
                              style="width: 100%"
                              border stripe>
                              <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                  class="input-new-tag"
                                  v-if="scope.row.inputVisible"
                                  v-model="scope.row.inputValue"
                                  ref="saveTagInput"
                                  size="small"
                                  :autofocus="true"
                                  @keyup.enter.native="handleInputConfirm(scope.row)"
                                  @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                      </el-table-column>
                        <!-- 索引列 -->
                      <el-table-column type="index">
                      </el-table-column>
                      <el-table-column label="参数名称" prop="attr_name">
                      </el-table-column>
                      <el-table-column label="操作">
                          <template  slot-scope="scope">
                              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
                              <el-button type="danger" icon="el-icon-delete" size="mini"  @click="deleteCates(scope.row)">删除</el-button>
                          </template>
                      </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="idBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData"
                              style="width: 50%"
                              border stripe>
                     <!-- 展开行 -->
                         <el-table-column type="expand">
                            <template  slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                  class="input-new-tag"
                                  v-if="scope.row.inputVisible"
                                  v-model="scope.row.inputValue"
                                  ref="saveTagInput"
                                  size="small"
                                  :autofocus="true"
                                  @keyup.enter.native="handleInputConfirm(scope.row)"
                                  @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                      </el-table-column>
                        <!-- 索引列 -->
                      <el-table-column type="index"></el-table-column>
                      <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                      <el-table-column label="操作">
                          <template  slot-scope="scope">
                              <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row)">编辑</el-button>
                              <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleteCates(scope.row)">删除</el-button>
                          </template>
                      </el-table-column>
                    </el-table>
                </el-tab-pane>
             </el-tabs>
        </el-card>
         <!-- 添加参数对话框 -->
            <el-dialog
                :title="'添加' + titleText"
                :visible.sync="addDialogVisible"
                width="50%"
                @close="addDialogClose"
                >
                <el-form :model="addForm" :rules="addFormRules" ref="addFormrRef" label-width="100px" class="demo-ruleForm">
                     <el-form-item :label="titleText" prop="attr_name">
                       <el-input v-model="addForm.attr_name"></el-input>
                     </el-form-item>
                </el-form>
                <!-- 底部按钮区域 -->
                <span slot="footer" class="dialog-footer">
                  <el-button @click="addDialogVisible = false">取 消</el-button>
                  <el-button type="primary" @click="addParams">确 定</el-button>
                </span>
            </el-dialog>
            <!-- 修改参数对话框 -->
            <el-dialog
                :title="'修改' + titleText"
                :visible.sync="editDialogVisible"
                width="50%"
                @close="editDialogClose"
                >
                <el-form :model="editForm" :rules="editFormRules" ref="editFormrRef" label-width="100px" class="demo-ruleForm">
                     <el-form-item :label="titleText" prop="attr_name">
                       <el-input v-model="editForm.attr_name"></el-input>
                     </el-form-item>
                </el-form>
                <!-- 底部按钮区域 -->
                <span slot="footer" class="dialog-footer">
                  <el-button @click="editDialogVisible = false">取 消</el-button>
                  <el-button type="primary" @click="editParams">确 定</el-button>
                </span>
            </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            cateProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态参数数据
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {},
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [ { required: true, message: '请输入参数名称', trigger: 'blur' } ]
            },
            // 修改表单的显示与隐藏
            editDialogVisible: false,
            // 修改表单的验证规则对象
            editFormRules: {
                attr_name: [ { required: true, message: '请输入参数名称', trigger: 'blur' } ]
            },
            // 修改表单的数据对象
            editForm: {
                attr_name: '',
                attr_id: ''
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
       async getCateList() {
            const { data: res } = await this.$http.get(`categories`)
            if (res.meta.status !== 200) {
               return this.$message.error('获取商品分类列表失败')
            }
            this.catelist = res.data
        },
        // 级联选择框选中项变化会触发这个函数
        handleChange() {
            this.getParamsData()
        },
        handleTabClick() {
            this.getParamsData()
        },
       async getParamsData() {
             // 证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
              params: { sel: this.activeName }
            })
             if (res.meta.status !== 200) {
               return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item => {
              item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                item.inputVisible = false
                 // 文本框中输入的值
                item.inputValue = ''
            })
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            } else {
                this.onlyTableData = res.data
            }
        },
        addDialogClose() {
            this.$refs.addFormrRef.resetFields()
        },
        // 点击按钮添加参数
        addParams() {
            this.$refs.addFormrRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 201) {
                  return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                // 刷新列表
                this.getParamsData()
            })
        },
        // 点击按钮展示修改对话框
       async showEditDialog(item) {
            this.editDialogVisible = true
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${item.attr_id}`)
            if (res.meta.status !== 200) {
                  return this.$message.error('获取参数失败')
                }
            this.editForm.attr_name = res.data.attr_name
            this.editForm.attr_id = res.data.attr_id
        },
        // 修改表单的关闭事件
        editDialogClose() {
            this.$refs.editFormrRef.resetFields()
        },
        // 发起修改参数请求
        editParams() {
            this.$refs.editFormrRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 200) {
                  return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                 this.getParamsData()
                 this.editDialogVisible = false
            })
        },
       async deleteCates(item) {
            const result = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        })
         .catch(err => err)
         if (result !== 'confirm') {
            return this.$message.info('已取消参数')
        }
        const { data: res } = await this.$http.delete(`categories/${item.cat_id}/attributes/${item.attr_id}`)
         if (res.meta.status !== 200) {
                  return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
                 this.getParamsData()
                 this.editDialogVisible = false
        },
        // 文本框失去焦点或按下enter都会触发
       async handleInputConfirm(row) {
              if (row.inputValue.trim().length === 0) {
                  row.inputValue = ''
                  row.inputVisible = false
                  return
              }
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
        },
       async saveAttrVals(row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if (res.meta.status !== 200) {
                  return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
        },
        showInput(row) {
            row.inputVisible = true
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus()
         })
        },
        handleClose(i, row) {
          row.attr_vals.splice(i, 1)
          this.saveAttrVals(row)
        }
    },
    computed: {
        idBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中三级分类的id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.cat_apt {
    margin: 15px 0;
}
.el-tag {
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>